Production of fast tints on acetyl cellulose



9 stuffs, indophenols,

Patented Mar. 10, 1931 UNITED STATES PATENT OFFICE WOLFGANG J'AJECK ANDJOSEPH LANG, F

BASEL, SWITZERLAND, ASSIGNORS TO THE FIRM SOCIETY OF CHEMICAL INDUSTRYIN BASLE, OF BASEL, SWITZERLAND .PBQDUGTION OF FAST TIN No Drawing.Original application filed November 3, 12, 1924. Divided and thisapplication This application is divisional of application Ser. No.66,639, filed November 3, 1925.

It is known that insoluble dyestuffs, such as for instance certainunsulfonated azodyeanthraquinone derivatives, etc., may be employed forthe production of tints on acetyl cellulose. For this purpose, however,the products in question have to be brought into a fine state ofsubdivision.

0 This may be done, either by boiling the dyestufl paste with soapsolutions in presence of sodium carbonate and of an insoluble organicsolvent, as for exampletetraline of the formula H H H Mill -IN areobtained by mixing amino-anthraquin ones having aifim'ty for acetylcellulose with waste sulfite liquor, are well adapted to produce tintson acetyl cellulose, yielding, especially in presence of soaps orsulfonatedsoaps, as Turkey red oil, dyebaths which dye acetyl celluloseor acetyl cellulose silkvery uniform tints fast to rubbing, water,washing and, in some cases, to light.

Example 500 grams of a paste from 20 parts of 1 4- diaminoanthraquinoneand 80 parts of waste sulfite liquor of 50 per cent strength are mixedintimately with 10 liters of water of 50 C. and as many liters ofconcentrated soap solu- TS 0N ACETYL CELLULOSE 1925, filed tions as arenecessary to obtain afterwards a dyebath containing 2 parts per thousandof soap. The mixture is then diluted with cold water to about 300liters. 10 kilograms of acetyl cellulose silk yarn are introduced intothe dyebath thus obtained, worked, the dyebath brought to 75 C. withinof an hour, and the goods dyed further for 15 minutes at thistemperature. The yarn is then rinsed and brightened as usual. There arethus obtained bright pure violet tints. Red to orange tints are obtainedwith 1 5- or 1: 8-diaminoanthraquinone, 1 4-hydroxyaminoanthraquinone,1-methoxy-4-aminoanthraquinone, etc.; blue shades with 1-aminoaryl-4-aminoanthraquinone derivatives or anthraquinone derivatives whichcontain more than two u-flllllllO groups.'

The process described in the example above is adapted to fabrics fromcotton-acetyl cellulose sllk or viscose-acetyl cellulose silk; for unionfabrics, however, containing besides acetyl cellulose animal fibers,such as wool or natural silk, it is preferable not to add any soap whilepreparing the dyebath. In this case it may be dyed in an acid bath, ifthe constitution of the dyestuffs agrees with it, without impairing thecolloidal state and the 03%2VLfilty of dyeing.

at we claim is z-- The herein described process for the production oftints on acetyl cellulose, which comprises treating the acetyl cellulosewith a colloidal preparation from an intermixture of aminoanthraquinoneshaving an afiinity for acetyl cellulose with waste sulfite liquor.

In witness whereof, we have hereunto signed our names this 16th day of Aril, 1930.

WOLFGANG J EOK. JOSEPH LANG.

